This guide explains why traditional ping often fails to reveal service issues, introduces Tcping as a reliable TCP‑based port probing tool, and provides step‑by‑step instructions for using it on Windows and Linux, including installation, common parameters, comparison with other utilities, and practical monitoring scripts.
This article explains what netcat (nc) is, outlines its primary functions such as listening on TCP/UDP ports, scanning, file transfer and speed testing, details common command‑line options, and demonstrates how to test UDP connectivity with an example command.
This guide introduces the powerful Netcat (nc) tool, covering installation on CentOS, core syntax and options, practical examples for TCP/UDP port testing, file and directory transfer between servers, and a method to benchmark network throughput using /dev/zero and dstat.
This guide explains how to verify TCP port connectivity on Linux using telnet and nc, shows how to interpret their output for open or closed ports, describes ways to exit these tools, and demonstrates how netstat can confirm the connection state and identify the owning process.
Netcat (nc) is a compact, versatile network utility often called the Swiss‑army knife of networking, and this guide explains its syntax, option meanings, and provides practical examples for port scanning and connection testing using both TCP and UDP protocols.
This article describes a real‑world Ceph storage incident caused by disk bad sectors, analyzes its impact, and presents two practical recovery methods—full disk copy with dd+nc and skipping the faulty sector during service start—along with detailed commands and post‑recovery steps.
This guide explains the SSH protocol, demonstrates how to generate and use public‑key authentication, and shows practical techniques—including ssh one‑liner commands, scp file aggregation, and nc data transfer—to perform batch operations across multiple Linux servers without password prompts.
This guide explains how SSH public‑key authentication works, walks through generating key pairs, shows the connection handshake, and demonstrates practical batch command execution and file collection across multiple Linux servers using ssh, scp, and nc.
